Russia? Einzbern house? I thought it's in Germany.

Kraco said:

Russia? Einzbern house? I thought it's in Germany.

It is, this is the artist's mistake, unless he/she is suggesting Einzberns have another house in Russia.

[deleted]

They does have Castle in Japan.
Why not Russia.

Given he says “lover”, I think one with Maya would be more appropriate

When he says castle, he probably was referring to the Einzberns main house and not the one that was used as their hideout in fate/zero.